Which statement about a convex lens is incorrect?

• A. Parallel light rays converge after passing through a convex lens.
• B. A convex lens can form real images.
• C. A convex lens can magnify objects.
• D. Parallel light rays converge in front of a convex lens.

Answer: (D)

A convex lens bends parallel incoming light toward a focal point on the opposite side, so those parallel rays converge after they pass through the lens. That means the statement saying parallel light rays converge in front of the lens is incorrect. The lens acts as a converging element, bringing parallel rays to a focus beyond the lens.

The other points are true: parallel rays do converge after passing through the lens, a convex lens can form real images (when the object is outside the focal length, the image forms on the opposite side), and it can magnify objects (when the object is within the focal length, producing a virtual, upright, magnified image seen through the lens).